I have a number of very old .efx documents (from 2004) that were sent to me from the eFax service. They are no longer available on eFax's website (so I can't just get them from there and change the format). (I changed eFax's setting a long time ago to send me new faxes in PDF format, so this problem only applies to my very old faxes.)

The most recent version of eFax Messenger is a PowerPC app so it can't be opened on recent versions of Mac OS X.

The simplest way seems to be just downloading eFax Messenger on a computer with Windows, but since I don't have access to one that's not an option.

So does anyone know of an all-Mac way to open these files? Or a way to convert them into a file format that I can open, e.g., PDF or TIFF?